Brake.



P. HALLOT.

BRAKE.

APPLIOATION IILBD 11017.8,1907.

Patented Apr. 4, 1911.

n/up zh, QM Mi 40 brake collar a is pivoted to axle is so that which are fi ed to the frame of the car.

PAUL BALLOT, OF VEBSAILLES, IERANGE.

BRAKE.

Specification of Letters Patent.

Patented Apr. 4, 1911.

Application filed November 8, 1907. Serial No. 401,244.

To all whom it may concern:

Be-it known that I, PAUL HALLOT, a citizen of France, residing at 2' Boulevard de Lesseps, Versailles, France, have invented certain new and useful Improvements in Brakes, of which the following is a specifigitudinal section. Fig. 2 represents a cross section on line A--B of Fig. 1. Figs. 3 and 4 are end views of the apparatus.

Referring to the drawings, a is the axle and b the spindle upon which the wheel rotates; c is the pinion for driving the wheel of the car which has to be braked. A brakebox (2 is fixed upon the side of said pinion c which is turned away from the wheel, said brake-box revolving at the same speed as the wheel. A loose crown e is located in the brake-box d. The brake-box d is prolonged to facilitate its fitting up, by a flange of an inner diameter equal to that of the oose crown e. The brake-box. is closed at its inner end by a disk 9 and at its outer end by a disk '7. v The brake-box d carries two axles z and k which are parallel to spindle 12 around which they revolve with the wheel. The disk 9 carr'es two similar axles Z and I'm 11 the brake-box J, p, g, 72. there are located three pairs of hal brake collars, which are constructed as shown in Fig. 2. The first its halves can be moved outward by means of a cam 0 fixed upon axle i. The second brake collar 7) is pivoted upon the axle m and, it is controlled by a cam q fixed upon axle Z; the third brake collar 1 is pivoted upon the axle l and is adapted to be operated by a cam 8 fixed upon the axle m. The two collars n and pans adapted to come in frictional contact with the loose crown e, while the third collar 1' is designed to come into frictional contact with the flange f of the brake-box.

A lever t is fixed upon the axle k outside the brake-boxd, f, g, I having a counterweight a fixed to its free end. Said lever t is, in any suitable manner, connected with a lever 1' adapted to revolve the axle z. Upon the disk 9 an axle 'w is fixed outside the brake-box which can be revolved by means of a draw-rod a: which is connected with the foot-lever operated by the driver. The rotation of said axle w is transmitted to the axles Z and m by means of suitable connecting'links which are simultaneously revolved if the conductor of the car presses upon the foot-lever for the brake.

The apparatus operates as follows :-If no action is exerted upon the cams 0, q and 8 designed to operate the brake collars n, p, r, said brake-collars are, by .means of the draw-spring 3 pulled away from the parts to be brought in frictional contact. When the car is running, the centrifugal force acting upon the masses it maintains the axle i in such a position, that the corresponding cam 0 brings the brake-collar n in contact with the loose crown e which revolves at the vsame speed as the wheel of the car. The

two other brake-collars are out of frictional contact. To brake the car the conductor presses upon the foot-lever whereby the axles l and m are simultaneously rotated and the fixed brake-collars p and 1' pressed against the loosecrown e and the flange f of the brake box respectively.

The flange f of the brake-box is the organ for the constant braking action as it acts as' long as the wheel revolves, the brake-box being rigid with the wheel. The brakeshoes 11. however serve for producing the variable braking action which dependson the speed of the car; if the wheel revolves quickly, the loose crown e will also-revolve quickly and consequently the friction between said crown and the brakeshoes n will be very energetic. This friction decreases with the speed of the car; if the car has reduced its speed to a certain limit, the counterweight a, being no longer influenced by the centrifugal force, remains inits normal position an as the cam o no lon er acts upon the brake-collars 7, these will c withdrawn so that the loose crown e sto s. The variable braking action ceases and t e wheel can again revolve. This revolution of the wheel will again operate the cam 0 throu h the intermediary of the masses a so that t e variable braking action is applied again.

I claim:

A brake for motor cars comprising in combination a brake-box composed of two parts, of which the one revolves with the pling-collar for dragging said crown along with the wheel owing to the action of a centrifugal mass influencing said collar through I the intermediary of a cam, two axles pivoted in the fixed part of the brake-box having cams which act upon two pairs of the brake-collars so that the one is pressed against the loose crown for obtaining the variable braking action depending on the speed of the car and the other against flange of the brake box for exerting a constant braking action, if the foot-lever for the 15 brake be pressed down by the conductor of the car, substantially as described and for the purpose set forth.

In testimony whereof I have hereunto set my hand in presence of two subscribing wit- 20 nesse's.

PAUL HALLOT.

Witnesses i H. C. COKE,

ALFRED Fawn 

